Nicholas Griewahn

Nicholas Griewahn

Associate Professor of Technology and Occupational Sciences

Office: 120-A Jacobetti Complex
Phone: 906-227-1524

Biographical Profile

Nicholas Griewahn has taught heating, ventilation, air conditioning and refrigeration classes at NMU since 2006. Prior to his hire he tutored and mentored students in the same classes he now teaches.  He has worked as an HVACR service and installation technician for over 20 years, primarily in the commercial refrigeration field.  His duties included design, installation, maintenance, troubleshooting and repair of mechanical HVACR equipment on the all levels. He is EPA universally certified and NATE certified in Heat Pumps and Air Conditioning and holds a current Michigan mechanical license.  He is an Associate Member of ASHRAE and is also a certified educator in the commercial refrigeration, commercial air conditioning and heat pump fields. 

Nick’s professional interests include energy management and conservation research as related to the refrigeration field and alternate refrigerant solutions.  He especially enjoys teaching courses related to the control system and wiring of refrigeration and air conditioning systems.  Outside of work, Nick enjoys outdoor activities including bird hunting, fishing, snowshoeing.  These activities are much more enjoyable when he has the chance to spend time outside with his wife and young son.

Nick encourages interested students to obtain degrees in the fast-paced and exciting career of HVACR. He believes the most exciting aspect of this profession is the fact that it is at the forefront of the “green” movement and for that reason has a lot of cutting edge technology and is constantly changing.  This industry is a necessity for homes and business, which ensures job security for its workers, and given the projected shortage of technicians over the next 10-20 years, students can feel comfortable in knowing that there will be positions available to them upon graduation. This is a challenging career that fosters teamwork and allows for interaction with other members of the team, as well as members of the community. 

Nick advocates NMU’s School of Technology and Applied Sciences' HVACR program due to smaller class sizes and the individual attention given to students at a reasonable cost. He also feels that the hands on training students get in the well-equipped lab is very realistic and better serves students making the transition from education to professional practice.

Courses Taught

IM 105: Applied Technical Mathematics
IM 115: Electricity for Industrial Maintenance
HV 170: Applied Electricity for Trades
HV 172: Basic Refrigeration
HV 174: ACR System Principles and Methods
HV 260: Principles of Air Delivery Systems
HV 271: Advanced Commercial Refrigeration Systems 
HV 275: HVACR Fieldwork, Contracting and Business Operations


  • B.S., M.S. Northern Michigan University
  • Current Michigan Mechanical Contractor License
  • EPA Universally Certified; NATE Certified; CSME Certified
  • Certified Heat Pump, Commercial Air Conditioning and Commercial Refrigeration Educator